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>> I just wonder if its big to carry all 85 crew and just break out and surface.

it has anyways been confirmed in article above. dont think of it as a "room" in which people can move around. think of it as we do a lift - 13 people can fit into a smallish lift and 20 inside a typical office lift. it will be tightly packed but nobody expects to be in there for hours. there are 3 "storeys" of seats/standing spots there arranged around a central atrium probably.there's probably some depth limit beyond which such devices cannot be deployed.

khan subs dont have it probably because they didnt operate in shallow littoral waters earlier. neither did they practice the escape suit drills while the british and we did. now having to move into the seas near china they are doing the drills though nothing can be done about the virginia design at this stage.

Indian Navy is all set to operate five nuclear submarines by the end of this decade, including two leased from Russia and three built indigenously.

India is considering a proposal to induct another nuclear submarine built in Russia and has plans of indigenously building two more Arihant Class underwater vessels to guard its maritime boundaries, Defence Minister A K Antony said.

The Navy yesterday formally commissioned the Akula-II Class INS Chakra in Vishakhapatnam and is set to launch the INS Arihant for sea trials soon.

On India's plans to expand its nuclear submarine fleet, Antony said the government was considering a proposal in this regard and the country can afford to buy another such vessel.

"There is a proposal...Cost is not necessary. India can afford it... In the next few years, the Navy will get more submarines," the Defence Minister said at the commissioning of INS Chakra.

Any new Akula-2 purchase will be new built ones , the Russian operate older Akula which is not worth buying as they have very less hull life left and needs extensive upgrades.

New Akula-2 will be faster to build as what ever IN wanted in Chakra class was tested via Nerpa standard and its easy to mass produce a subs as they dont need to go through extensive testing and validate stuff again as the first of class has to.

Singha fine with Rescue capsule , they are just suppose to gather in that capsule when the subs gets stranded deep in sea and cannot surface , the rescue capsule will just leave the sub with all crew and surface up , to be then rescued by surface ship. Khan uses DSRV for such purpose.

i dont think rus will have space nd people to build a one off new akula. they r busy with yasen and borei lines. they need boreis badly to retire deltas.nd yasen to supplement the akulas. force disparity with khan is huge.

Singha wrote:i dont think rus will have space nd people to build a one off new akula. they r busy with yasen and borei lines. they need boreis badly to retire deltas.nd yasen to supplement the akulas. force disparity with khan is huge.

chaanakya wrote:Well Two Akulas ( another being negotiated) and Five more Arihant Class ( excluding One already undergoing trial). Two in construction stages and three in various drawing stages. Thats a total of eight.

And dont forget adding the SSN group. IN is contemplating for a 6 to 9 SSN in its armada.

Here's my calculations on how many SSN the IN will need in the next 10-15 years:

According to wiki, Kuguar, Rys and a third hull were reused to construct the three Borei SSBNs. However there's a fourth hull Irbis lying 80% complete. It appears to be an Akula 1 Improved standard as opposed to Akula II.

The Project 971 nuclear-powered attack submarine K-152 Nerpa was delivered to the Indian Navy on Wednesday. But it is not the only Russian naval system to be exported to India this year. Russia and India plan to complete several other naval contracts, which could make 2012 “the year of the navy” in bilateral military technical cooperation.Nerpa aka Chakra

Construction of the Nerpa, re-commissioned as the INS Chakra II, was launched in 1991 and completed in the 2000s for lease to India.

Initially, it was to be delivered in 2007, but the adjustment of its equipment took longer than expected. In 2008, the submarine’s fire safety system accidentally activated during trials in the Sea of Japan, killing 20 people. Among the dead, 17 were civilian technical specialists.

Some blame the accident on the modifications made to the Molibden-I central command console at India’s request.

There were other accidents on the Nerpa though none of them as serious the one in 2008. For example, the system started to fill and empty ballast tanks without operator's input and had to be switched off. Many of them were connected with the Molibden system, which is alarming because it is supplied to the Project 955 Borei class missile submarines.

At any rate, the Nerpa has been commissioned and leased to India for 10 years for nearly $1 billion. But this is only the first naval delivery this year.

It would be worth picking up the improved Ak-1 sub supposedly "80%" complete,if the sub can be built to Chakra std.I wonder whether it really is that advanced in construction as the RN would've seen to its fast completion/induction given its need for new subs.The internal eqpt.,reactor,weapons,sensors and C&C package is the key,as hull wise ,apart from the Gepard's subtle differences and the smaller TAS pod,they all Ak-2/3 look similar.

Russia now builds N-subs within 4 years! So it shouldn't be too difficult to finish an incomplete Ak-1/2 before 2015 if the decision to acquire a second sub is taken now.Perhaps it already has in principle,and we are being mentally prepared for the second.Until at leats 3 ATV/SSBNs are commissioned into the IN,we cannot build our own smaller sized SSGNs.In fact the full number of SSBNs sshlould be first built at home before we add indigenous SSGNs.Acquiring 2-3 Akulas would be the most cost-effective option .One reason for the "lease" and not outright purchase is that the lease probably a "dry lease",without a crew,comes with a full warranty on maintenance,etc.,where any technical malfunction,spares required,etc., would be looked after by the supplier.

Lisa, I am afraid that you are wrong. SSBNs are escorted by more than one SSN. To remain undetectable the SSBN need restrict its speed around 4-8 knots and also it has limited capabilities to defend itself after BM launch(es).

Lisa, I am afraid that you are wrong. SSBNs are escorted by more than one SSN. To remain undetectable the SSBN need restrict its speed around 4-8 knots and also it has limited capabilities to defend itself after BM launch(es).

This is not correct.

A submarines greatest asset is freedom of movement in three dimensions. Operating in packs restricts flexibility.

(Only exception is a pack with a single mission responsibility - team up against a surface convoy where the number of targets and threats is too high for a single submarine. But this mission doesnt require any flexibility.)

All US, UK, French and Soviet SSBNs operate(d) solo.

Only exception were USSR Delta class, with boxy missile launchers to accomodate larger missiles that could reach continental US. The Delta class missile hump was grossly hydrodynamically inefficient, and hence they operated at slow speed. The operated in Soviet territorial waters. And their escorts patrolled those territorial waters. The Delta class were more like self-propelled-missile-pontoons rather than submarines.

The concept of SSBN escorted by SSN is BS. Two submarines operating in tandem at close range will need to communicate, for navigation and safety purposes, and this communication can be easily picked up by the enemy.

Submarines, missile carrying or attack, have well defined operating sectors, and other submarines stay away. Identification-of-Friend-or-Foe amd short range traffic awareness is still a major headache for all submarines.

US Navy Carrier groups include an attack submarine, but that submarine does not "escort" the carrier like a SPG around Mayawati. It is usually many miles away patroling a particular sector, like a sniper on a roof, or a scout deployed ahead. A submarine's silence makes it an ideal scout/sniper.

Most submariners find Tom Clancy's stories akin to those from our very own Chorgupta.

Only exception were USSR Delta class, with boxy missile launchers to accomodate larger missiles that could reach continental US. The Delta class missile hump was grossly hydrodynamically inefficient, and hence they operated at slow speed. The operated in Soviet territorial waters. And their escorts patrolled those territorial waters. The Delta class were more like self-propelled-missile-pontoons rather than submarines.

Doesn't that also apply to the Xia (Type 092) and Jin (Type 094) classes in PLAN ? They both look hunchbacked. Granted, they've probably never done a true deterrence patrol either, with the sole Xia essentially being a drydock queen and its sister ship at the bottom of the Yellow Sea.

simply put, navies that employ the bastion doctrine have need of sanitizing waters, whether with SSNs, warships or MPA's. soviets used a combo of bastion and deterrence patrols. US solely deterrence patrols. china, till date a limited version of bastion doctrine.

Unlike conventional submarines that India operates which need to surface to charge their batteries often - sometimes as frequently as 24 hours - INS Chakra can stay under as long as it wants. Its ability to stay underwater is restrained only by human endurance to stay underwater. Also, another problem that the submarine could face is acidity. This is because of a lack of exercise inside due to prolonged deployments.

can anyone please explain acidity problem and human endurance staying in a sub.

Looking at the stats above Reactor OP 190 mw, turbine power 43k hp, efficiency (of this part of cycle) 31% a propulsive steam plant is very efficient if it is 30%.+

Say (Vessel) at 10 kts 24x7 she has a range of 100days = 24x7x100=16,800 nmilesIt is less than 8000nm fm vizag to shangai , you could go to the northern russia on this range, So maybe we start playing cat and mouse in the yellow sea??

There is another incomplete Hull Irbis that 60 % complete , this would be the second Akula that can be leased.source

2008-2009, - In the Russian Navy submarine pr.971 12, 6 pc on the SF and PF. - 2009 May 11 - during the visit of Russian Prime Minister Vladimir Putin at the Amur CVD was examined by an unfinished chassis serial number 519 ("Irbis ").

Housing and screw submarine pr.971I factory № 519 in the shop number 19 in the North Amur Komsomolsk-na-Amur, May 11, 2009